> Conflicts is just more strict Breaks,
Eh, no.
ehm, yes: 7.4: Conflicts ... This is a stronger restriction than Breaks
You're claiming that the systemd support of your package won't work
correctly unless you have a particular version of systemd on your
system. If that's the case, then you should Depend on the correct
version of systemd. If you also support other init systems, you can add
an alternate dependency on those other systems; or you can use
Recommends: rather than Depends: if you don't want it to be absolute.
but I want my package to work without init systems, for example inside Docker. But if systemd is installed, I need >= version.